ZooKeeper常用命令行操作

通过./zkCli.sh 打开zk的客户端进入命令行后台

ls/ls2 列出当前节点下的子节点 ls2还会列出当前节点的状态

[zk: localhost:2181(CONNECTED) 5] ls2 /

[cluster, controller_epoch, brokers, zookeeper, admin, isr_change_notification, consumers, log_dir_event_notification, latest_producer_id_block, config]

cZxid = 0x0

ctime = Thu Jan 01 08:00:00 CST 1970

mZxid = 0x0

mtime = Thu Jan 01 08:00:00 CST 1970

pZxid = 0x4e

cversion = 14

dataVersion = 0

aclVersion = 0

ephemeralOwner = 0x0

dataLength = 0

numChildren = 10

get 与 stat命令
- stat 列出节点状态 ls2相当于 ls + stat

[zk: localhost:2181(CONNECTED) 6] stat /

cZxid = 0x0

ctime = Thu Jan 01 08:00:00 CST 1970

mZxid = 0x0

mtime = Thu Jan 01 08:00:00 CST 1970

pZxid = 0x4e

cversion = 14

dataVersion = 0

aclVersion = 0

ephemeralOwner = 0x0

dataLength = 0

numChildren = 10

get命令获取节点内容和节点状态

[zk: localhost:2181(CONNECTED) 8] get /zookeeper

cZxid = 0x0 #该节点创建（Create）时的id

ctime = Thu Jan 01 08:00:00 CST 1970

mZxid = 0x0 #该节点修改（Modify）后的id

mtime = Thu Jan 01 08:00:00 CST 1970

pZxid = 0x0 #子节点列表最后一次被修改的事务id

cversion = -1 #子节点的版本号

dataVersion = 0 #当前节点数据的版本号 节点数据改变时这个值会变化

aclVersion = 0  # 权限版本, 权限发生变化时版本号回发生变化

ephemeralOwner = 0x0

dataLength = 0 #数据长度

numChildren = 1 #子节点数量

4.2 zk特性 session的基本原理与create命令使用

客户端与服务端之间的链接存在Session(会话)
每个会话可以设置一个超时时间
心跳机制: 客户端向服务端的ping包请求
心跳结束, session则过期
Session过期, 则临时节点znode会被抛弃

create命令

[zk: localhost:2181(CONNECTED) 10] create /czk czk-data #创建永久节点

Created /czk

[zk: localhost:2181(CONNECTED) 11] get /czk

czk-data

cZxid = 0x50

ctime = Sat Dec 29 17:17:53 CST 2018

mZxid = 0x50

mtime = Sat Dec 29 17:17:53 CST 2018

pZxid = 0x50

cversion = 0

dataVersion = 0

aclVersion = 0

ephemeralOwner = 0x0

dataLength = 12

numChildren = 0

创建临时节点 &session过期临时节点删除

[zk: localhost:2181(CONNECTED) 12] create -e /czk/tmp czk-data

Created /itheima/tmp

[zk: localhost:2181(CONNECTED) 13] get /czk

itheima-data

cZxid = 0x50

ctime = Sat Dec 29 17:17:53 CST 2018

mZxid = 0x50

mtime = Sat Dec 29 17:17:53 CST 2018

pZxid = 0x51

cversion = 1

dataVersion = 0

aclVersion = 0

ephemeralOwner = 0x0

dataLength = 12

numChildren = 1

创建顺序节点

[zk: localhost:2181(CONNECTED) 1] ls /czk

[]

[zk: localhost:2181(CONNECTED) 2] create -s /czk/sec seq

Created /itheima/sec0000000001

[zk: localhost:2181(CONNECTED) 3] create -s /czk/sec seq

Created /itheima/sec0000000002

[zk: localhost:2181(CONNECTED) 4] ls /czk

[sec0000000001, sec0000000002]

4.3 set/delete 命令

set命令:

 set path data [version] # set 路径 数据 [版本号]       []内为可选参数

不传入版本号

[zk: localhost:2181(CONNECTED) 17] get /czk

czk-data1

cZxid = 0x5b

ctime = Sat Dec 29 17:45:26 CST 2018

mZxid = 0x66

mtime = Sat Dec 29 18:00:12 CST 2018

pZxid = 0x65

cversion = 5

dataVersion = 1

aclVersion = 0

ephemeralOwner = 0x0

dataLength = 13

numChildren = 3

[zk: localhost:2181(CONNECTED) 18] set /czk czk-data2

cZxid = 0x5b

ctime = Sat Dec 29 17:45:26 CST 2018

mZxid = 0x67

mtime = Sat Dec 29 18:02:15 CST 2018

pZxid = 0x65

cversion = 5

dataVersion = 2

aclVersion = 0

ephemeralOwner = 0x0

dataLength = 13

numChildren = 3

[zk: localhost:2181(CONNECTED) 19] get /czk

czk-data2

cZxid = 0x5b

ctime = Sat Dec 29 17:45:26 CST 2018

mZxid = 0x67

mtime = Sat Dec 29 18:02:15 CST 2018

pZxid = 0x65

cversion = 5

dataVersion = 2

aclVersion = 0

ephemeralOwner = 0x0

dataLength = 13

numChildren = 3

不传入版本号可能会有并发修改问题可以通过指定版本号类似加锁功能

[zk: localhost:2181(CONNECTED) 22] set /czk czk-data3 1

version No is not valid : /czk  #版本不匹配 修改失败 当前版本2

[zk: localhost:2181(CONNECTED) 23] set /czk czk-data3 2

cZxid = 0x5b

ctime = Sat Dec 29 17:45:26 CST 2018

mZxid = 0x69

mtime = Sat Dec 29 18:29:21 CST 2018

pZxid = 0x65

cversion = 5

dataVersion = 3

aclVersion = 0

ephemeralOwner = 0x0

dataLength = 13

numChildren = 3

[zk: localhost:2181(CONNECTED) 24] get /czk

itheima-data3

cZxid = 0x5b

ctime = Sat Dec 29 17:45:26 CST 2018

mZxid = 0x69

mtime = Sat Dec 29 18:29:21 CST 2018

pZxid = 0x65

cversion = 5

dataVersion = 3

aclVersion = 0

ephemeralOwner = 0x0

dataLength = 13

numChildren = 3

delete 命令: delete path [version]

[zk: localhost:2181(CONNECTED) 25] ls /czk

[sec0000000003, sec0000000001, sec0000000002]

[zk: localhost:2181(CONNECTED) 27] delete /czk/sec000000000

sec0000000003   sec0000000001   sec0000000002

[zk: localhost:2181(CONNECTED) 27] delete /czk/sec0000000001

[zk: localhost:2181(CONNECTED) 28] ls /czk

[sec0000000003, sec0000000002]

[zk: localhost:2181(CONNECTED) 29] set /czk/sec000000000

sec0000000003   sec0000000002

[zk: localhost:2181(CONNECTED) 29] set /czk/sec0000000002 test2

cZxid = 0x64

ctime = Sat Dec 29 17:49:38 CST 2018

mZxid = 0x6b

mtime = Sat Dec 29 18:54:33 CST 2018

pZxid = 0x64

cversion = 0

dataVersion = 1

aclVersion = 0

ephemeralOwner = 0x0

dataLength = 5

numChildren = 0

[zk: localhost:2181(CONNECTED) 30] delete /czk/sec000000000

sec0000000003   sec0000000002

[zk: localhost:2181(CONNECTED) 30] delete /czk/sec0000000002 0

version No is not valid : /czk/sec0000000002

总结使用set / delete命令的时候尽量使用版本号避免误操作

4.4 watcher机制

针对每个节点的操作, 都会有一个监督者->watcher
当监控的某个对象(znode)发生了变化, 则触发watcher事件
zk中的watcher是一次性的, 触发后立即销毁
父节点, 子节点增删改都能触发其watcher
针对不同类型的操作, 触发的watcher事件也不同:
- (子)节点创建事件
- (子)节点删除事件
- (子)节点数据变化事件
watcher命令行
- 通过get path [watch]设置watcher
- 父节点增删改操作触发 watcher
- 子节点增删改操作触发 watcher

创建父节点触发: NodeCreated

stat path [watch]

[zk: localhost:2181(CONNECTED) 33] stat /czk watch

Node does not exist: /itcast

[zk: localhost:2181(CONNECTED) 35] create /czk 123

WATCHER::Created /czk

WatchedEvent state:SyncConnected type:NodeCreated path:/czk

get path [watch]

[zk: localhost:2181(CONNECTED) 36] get /czk watch

123

cZxid = 0x6d

ctime = Sat Dec 29 19:43:13 CST 2018

mZxid = 0x6d

mtime = Sat Dec 29 19:43:13 CST 2018

pZxid = 0x6d

cversion = 0

dataVersion = 0

aclVersion = 0

ephemeralOwner = 0x0

dataLength = 3

numChildren = 0

[zk: localhost:2181(CONNECTED) 37] set /itcast 789

WATCHER::

WatchedEvent state:SyncConnected type:NodeDataChanged path:/czk

cZxid = 0x6d

ctime = Sat Dec 29 19:43:13 CST 2018

mZxid = 0x6e

mtime = Sat Dec 29 19:47:24 CST 2018

pZxid = 0x6d

cversion = 0

dataVersion = 1

aclVersion = 0

ephemeralOwner = 0x0

dataLength = 3

numChildren = 0

ls/ls2 path [watch]

[zk: localhost:2181(CONNECTED) 38] ls /czk watch

[]

[zk: localhost:2181(CONNECTED) 39] delete /czk

WATCHER::

WatchedEvent state:SyncConnected type:NodeDeleted path:/czk

ls为父节点设置watcher, 创建子节点触发:NodeChildrenChanged
ls为父节点设置watcher, 删除子节点触发:NodeChildrenChanged

ls为父节点设置watcher, 修改子节点不触发事件

[zk: localhost:2181(CONNECTED) 49] ls /czk watch

[sec0000000003, dir1, sec0000000002]

[zk: localhost:2181(CONNECTED) 51] create /czk/dir2 123

WATCHER::Created /czk/dir2

WatchedEvent state:SyncConnected type:NodeChildrenChanged path:/czk

[zk: localhost:2181(CONNECTED) 52] ls /czk watch

[sec0000000003, dir2, dir1, sec0000000002]

[zk: localhost:2181(CONNECTED) 53] delete /czk/dir2

WATCHER::

WatchedEvent state:SyncConnected type:NodeChildrenChanged path:/czk

[zk: localhost:2181(CONNECTED) 54]

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ZooKeeper常用命令行操作

ZooKeeper常用命令行操作

4.2 zk特性 session的基本原理与create命令使用

4.3 set/delete 命令

4.4 watcher机制

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